This paper deals with the structural response and wall thickness design of pulse detonation combustor. The pulse detonation combustor is a chamber with cylindrical shell structure, which is loaded with internal moving detonation pressure and thermal load. Much higher strain and stress can be excited under moving pressure load than static load. How to choose the attenuation coefficient during detonation pressure were discussed. The results of structural response simulation based on finite element method were compared with analytical result in the literature. The multi-cycle detonation pressure load and thermal load were measured on a pulse detonation engine principle prototype initialed through deflagration-to-detonation transition for the first time. The structural response characteristics of the detonation chamber were studied based on the measured load under different working frequencies. A series of comparison between numerical simulation and experimental measurement were carried out. The wall thickness of the chamber was designed based on the fatigue load spectrum under real detonation load and the chamber’s target fatigue life. Special attention was paid to the mutual influence between the dynamic amplification factor and the wall thickness.

中文翻译：

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脉冲爆震燃烧室结构响应及壁厚设计

本文主要研究脉冲爆震燃烧器的结构响应和壁厚设计。脉冲爆震燃烧器是一个圆柱壳结构的燃烧室，内部承受移动爆震压力和热载荷。在移动压力负载下可以激发比静态负载高得多的应变和应力。讨论了如何选择爆轰压力过程中的衰减系数。将基于有限元法的结构响应模拟结果与文献中的分析结果进行了比较。多循环爆震压力载荷和热载荷是在脉冲爆震发动机原理原型机上测量的，该原型机首次通过爆燃到爆震过渡进行初始化。根据实测载荷在不同工作频率下研究爆震室的结构响应特性。进行了一系列数值模拟和实验测量的比较。根据实际爆轰载荷下的疲劳载荷谱和舱室目标疲劳寿命设计舱室壁厚。特别注意动态放大系数和壁厚之间的相互影响。